1813948979 has 2 divisors, whose sum is σ = 1813948980. Its totient is φ = 1813948978.

The previous prime is 1813948963. The next prime is 1813948987. The reversal of 1813948979 is 9798493181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1813948979 - 2⁴ = 1813948963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1813948079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906974489 + 906974490.

It is an arithmetic number, because the mean of its divisors is an integer number (906974490).

Almost surely, 2^1813948979 is an apocalyptic number.

1813948979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813948979 is an equidigital number, since it uses as much as digits as its factorization.

1813948979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 59.

The square root of 1813948979 is about 42590.4799104213. The cubic root of 1813948979 is about 1219.5745580520.

The spelling of 1813948979 in words is "one billion, eight hundred thirteen million, nine hundred forty-eight thousand, nine hundred seventy-nine".